Microsoft Launches Three In-House AI Models, Deploys GPT-5.4 Thinking to Copilot, and Distances Itself from OpenAI Dependence

Microsoft unveiled public preview versions of three proprietary AI models via Microsoft Foundry (formerly Azure AI Studio): MAI-Transcribe-1 for speech recognition, MAI-Voice-1 for speech synthesis, and MAI-Image-2 for text-to-image generation — directly competing with OpenAI and Google offerings. Concurrently, Microsoft began rolling out OpenAI's GPT-5.4 Thinking to Microsoft 365 Copilot users as 'GPT-5.4 Think Deeper,' backed by a reported $250B Azure consumption commitment from OpenAI and a restructured partnership granting Microsoft a 27% equity stake. Despite this, Microsoft updated Copilot's terms of service to warn users to 'use Copilot at your own risk' for 'entertainment purposes only,' reflecting underwhelming Copilot revenue and growing competition from Claude and other rivals, as the company builds toward AI independence following the expiration of its OpenAI model exclusivity in October 2025.